package stool.juc.countlatch;

import java.util.concurrent.CountDownLatch;

/**
 * CountDownLatch主要有两个方法，当一个或多个线程调用await方法时，这些线程会阻塞。
 * 其他线程调用countDown方法会将计数器减1(调用countDown方法的线程不会阻塞)，
 * 当计数器的值变为0时，因await方法阻塞的线程会被唤醒，继续执行
 * @author Felix
 * @Description
 * @Date 2023-02-19
 */
public class CountDownLatchUsed {

    public static void main(String[] args) throws InterruptedException {
        CountDownLatch latch = new CountDownLatch(6);
        for (int i = 0; i < 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + "~离开教室");
                latch.countDown();
            }, String.valueOf(i)).start();
        }
        latch.await();
        System.out.println("关门");
    }
}
